/usr/mips64el-linux-gnuabi64/lib32/libnsl.so.1 is in libc6-mipsn32-mips64el-cross 2.27-3ubuntu1cross1.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/mips64el-linux-gnuabi64/lib32/libnsl-2.27.so
/usr/mips64el-linux-gnuabi64/lib32/libnsl-2.27.so